A detection device for detecting contamination of an optical element. The detection device includes a coupling device, including a first coupling element for coupling light of at least one wavelength from a light source into the optical element, and a second coupling element for coupling light out from the optical element, at least one of the coupling elements including a hologram, and having a detector for acquiring the coupled-out light.
Legal claims defining the scope of protection, as filed with the USPTO.
2. The detection device as recited in claim 1, wherein the hologram is a volume hologram.
3. The detection device as recited in claim 1, wherein the hologram is configured in deflecting fashion and at least partly in focusing fashion.
4. The detection device as recited in claim 1, wherein the hologram is a transmission grating or a reflection grating.
5. The detection device as recited in claim 1, wherein at least one of the first and second light guides is a holographic film.
6. The detection device as recited in claim 1, wherein at least one of the first and second light guides is at least partly in the cover.
8. The sensor device as recited in claim 7, wherein the object light source is configured to emit light towards the cover as a beam, and the object light source is arranged relative to the cover and relative to the first light guide so that a first beam region of the emitted beam passes the first light guide, thereby reaching the cover without impinging upon the first light guide, and a second beam region of the emitted beam impinges upon the first light guide.
10. The method as recited in claim 9, wherein the at least one of the first and second light guides is laminated onto the cover.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
January 15, 2019
April 2, 2024
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